Finished The Chain Game

[RiverShock]

Sableye, because they both learn Fury Swipes at Level 17 in the generation they debuted in.

 

[Xdog]

Shedninja, because they are both dual type Ghost Pokemon who debuted in Gen III.

 

[Their Goominess]

Azumarill. Both have an ability that makes them immune to Grass moves. (Sap Sipper for Azumarill, Wonder Guard for Shedinja).

 

[Dork Void]

Medicham. Both have pure power ability.

 

[Snorchu]

Hariyama. Both are 3rd-Generation Fighting-types.

 

[Dork Void]

Walrein. Both can have thick fat ability.

 

[Xdog]

Dewgong. They are both Pokemon that can have a 1/8 resistance to Ice.

 

[Snorchu]

Snorlax. Both can have Thick Fat.

 

[Pokeplayer44]

Blissey. Both fat, annoying normal types with a lot of HP.

 

[Dork Void]

Porygon-Z, both stage 2 normal types

 

[Xdog]

Roserade, both stage 2 Pokemon that are capable of being level 1.

 

[Pokeplayer44]

Togekiss, both are obtained with the use of a Shiny Stone.

 

[pokemaster563]

Staraptor. both normal/flying types.

 

[Dork Void]

Ho-oh, both can learn Brave Bird.

 

[Pokeplayer44]

Moltres. Both fire/flying.

 

[pokemaster563]

zapdos. another legendary trio bird.

 

[Inigo Montoya]

Articuno, moar legendary birds.

 

[Ratgeezer300]

snorlax - its located next to articuno in the pokedex

 

[Dork Void]

Happiny-both basic (in the generation they debuted in) normal types with hp as their best stat.

 

[Snorchu]

Togepi - Both spread happiness.